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    <title>Document</title>
    <script>
        //函数就是封装了一段可以被重复执行调用的代码块 目的：就是让大量的代码重复使用
        function getSum(num1, num2) {
            var sum = 0;
            for(var i=num1;i<=num2;i++){
                sum+=i;
            }
            console.log(sum);
        }
        getSum(1,100);
        getSum(10,100)
    </script>
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